HI Steffen
Yes there are a lot of bugs resolved in the latest patch. The one I found most useful was the case where upgrade table option failed with error "RTC-5270 Invalid Upgrade Plan"
This has been fixed now. There are a host of other bugs too which have supposedly been fixed

Resolved Issues
The following is a list of issues resolved in Oracle Warehouse Builder 10g Release 2 (10.2.0.4).

3992231 ERROR WHEN TRYING TO SEE THE COLUMN DATA TYPE IN KEY LOOKUP

4956010 ERRORS AFTER OPENING A MAP IN READ-ONLY MODE

5115574 PB IN EXPRESSION BUILDER WHEN USING PRIVATE FUNCTIONS WITH OBJECT TYPES

An update on my query performance issue after going from 10.2.0.3 to 10.2.0.4. To state things more carefully, we've found about 30 queries, all with similar syntax, that have gone from 0.5 secs to around 200 secs under 10.2.0.4. Support has given me a set of init params that are "supposed" to return the optimizer's behavior to 10.2.0.3 if we restore pre-patch stats. Unfortunately, the patch must be purging stats as part of its upgrade process. The oldest stats I now have (per DBA_TAB_STATS_HISTORY) is the day we put in the patch. Not nice.
Be warned!
Steve

1. Database Control did not start up. Had to ask Oracle Support for starting DB Control.
2. Then EM agent was not uploading metrics. Had to work with ORacle Support to get the EM agent to upload the metrices properly.